The argument came about when they were discussing relationships, and he decided to say she was single because she talked back. Obviously upset, she began to cry. He apologised, but said he wished he had known she was on her period so she would have “saved [him] from apologising so much!”

From then, he began tracking her cycle on his work calendar, which he sent to all of their male coworkers, so they were all alerted of her cycles.

He justified the calendar by calling it a “good strategy to track her period cycle in order to avoid unnecessary situations”.

“I’m just trying to stay away from trouble,” he added.

He even has a nickname for when she's on her period.“C63”, named “after the Mercedez Benz C63 that moves 0km to 100km in under four seconds ... that’s how fast her mood will change," he told news.com.au.au

But if you thought a calendar was bad. There's actual apps developed to do the 'hard work' for men.

PMS Buddy, which is no longer available, was developed to save relationships “one month at a time!” and let men track the periods of up to 10 women. OK, then.